Possible relationship between the radio and optical structures associated with the active galaxy Centaurus A

Details Possible relationship between the radio and optical structures associated with the active galaxy Centaurus A Possible relationship between the radio and optical structures associated with the active galaxy Centaurus A

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141...61g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 1, Dec. 1984, p. 61-66.

Astronomy and Astrophysics

Astrophysics

19

Active Galaxies, Elliptical Galaxies, Galactic Nuclei, Galactic Radio Waves, Galactic Structure, Radio Galaxies, Relativistic Plasmas, Astronomical Maps, Astronomical Models, Astronomical Photography, Interstellar Magnetic Fields, Plasma Jets

Scientific paper

A detailed comparison of the recent deep optical and radio photographs of the nearby radio galaxy Centaurus A (NGC 5128) is presented. This has provided evidence for dynamical interaction between the relativistic plasma and optically detected shell-type structures. Based on this, a new interpretation is suggested for the formation of multiple radio peaks observed in the two giant radio lobes of this active galaxy and also for their inversion symmetric morphology. Also proposed is a method for estimating magnetic field strength inside the radio lobes, based on dynamical considerations of the optical structures interacting with the radio components. The field, thus estimated for the northern inner radio lobe of Cen A, is nearly three times weaker than the value derived under the usual equipartition assumption. The marked bending of the Cen A jet towards this inner radio lobe could be interpreted in terms of what appears to be an encounter with a shell, provided the jet is light and moves with a bulk relativistic speed.

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